The Multifunctional Inorganic Builder for Detergents, Food Processing, Water Treatment, and Industrial Applications: Tripolyphosphate (STPP, CAS# 7758-29-4)

Sodium tripolyphosphate (CAS# 7758-29-4), commonly known as STPP, sodium triphosphate, or pentasodium triphosphate, is an inorganic polyphosphate salt with the molecular formula Na₅P₃O₁₀ and a molecular weight of 367.86 g/mol. Its molecular structure consists of a linear chain of three phosphate units linked by P–O–P bonds, forming a highly effective sequestering agent that can bind divalent and trivalent metal ions through its multiple negatively charged oxygen atoms. As a white, odorless, crystalline powder or granular solid, STPP is highly soluble in water and exhibits excellent chelating, dispersing, emulsifying, and buffering properties. The compound is typically supplied in two primary grades: Food Grade (≥94% purity) for applications in the food industry and Industrial/Technical Grade for use in detergents, water treatment, ceramics, and other industrial processes. It is also available in various physical forms, including powder, granules, and heavy dense forms.

Sodium tripolyphosphate is one of the most widely used inorganic chemicals globally, serving as a critical raw material in the detergent industry as a “builder” that softens water by sequestering calcium and magnesium ions. Beyond its core role in cleaning products, STPP functions as a water retention agent, emulsifier, and quality improver in food processing (E451), as a scale inhibitor and dispersant in industrial water treatment, and as a processing aid in ceramics, leather, mining, and other industrial sectors. Based on its chemical characteristics and industrial significance, this article systematically analyzes the key properties, core application areas, global market structure, regulatory landscape, and future outlook of this strategically important inorganic chemical.

Key Properties and Product Specifications

Sodium tripolyphosphate (CAS# 7758-29-4) is an inorganic polyphosphate whose value derives from its exceptional sequestering, buffering, and dispersing capabilities.

Key physicochemical parameters include:

• Molecular Formula: Na₅P₃O₁₀
• Molecular Weight: 367.86 g/mol
• CAS Number: 7758-29-4
• EINECS Number: 231-838-7
• Appearance: White, odorless crystalline powder or granules
• Purity: Food Grade (≥94%); Industrial Grade (≥94%–96%)
• Density: 0.9–1.0 g/cm³
• pH (1% solution): 9–11
• Solubility: Highly soluble in water
• FDA Listing: GRAS (Generally Recognized as Safe) under 21 CFR 182.6810
• E Number: E451
• UNII: 5HK03SA80J

The compound’s reactivity is defined by its ability to sequester calcium, magnesium, and other multivalent metal ions, forming soluble complexes that prevent precipitation and scale formation. This property is fundamental to its function as a detergent builder, water softener, and scale inhibitor. Its buffering capacity maintains optimal pH in various formulations, while its dispersing properties prevent the redeposition of soils and suspended particles.

Core Application Fields and Demand

Market demand for sodium tripolyphosphate (CAS# 7758-29-4) is concentrated in four primary sectors: detergent and cleaning product manufacturing (approximately 50–55% of global consumption), food processing and preservation (approximately 20–25%), industrial water treatment and oilfield applications (approximately 10–15%), and ceramics, leather, mining, and other industrial processes (approximately 10–15%). Its multifunctional sequestering and dispersing properties serve as the core drivers of sustained demand growth.

In detergent and cleaning product manufacturing, STPP is a core ingredient in laundry detergents, automatic dishwashing products, and hard surface cleaners. As a “builder,” it softens water by sequestering calcium and magnesium ions that would otherwise interfere with surfactant performance, thereby significantly enhancing the cleaning efficiency of detergents. STPP also functions as a dispersant, preventing the redeposition of dirt and soil onto cleaned surfaces. It is used in the production of synthetic detergents, soap builders, and bar soaps. The majority of STPP is consumed as a component of commercial detergents, making this the largest application segment for the compound.

In food processing and preservation, STPP is a widely used food additive designated as E451. It serves multiple functions in food processing: as a water retention agent to improve moisture retention in seafood, meats, poultry, and processed meats; as a quality improver and emulsifier; as a sequestrant for multivalent ions to prevent oxidation and discoloration; and as a texture enhancer and stabilizer in meat, poultry, seafood, and dairy applications. STPP is a preservative for seafood, meats, poultry, and animal feeds.

In industrial water treatment, STPP functions as a scale inhibitor and sequestering agent, preventing the precipitation of calcium and magnesium salts in boiler water, cooling water systems, and other industrial water circuits. It is used in potable water treatment and industrial water softening. In oilfield applications, STPP serves as a dispersant for drilling mud. It is also used in mining and ore flotation processes.

In ceramics, leather, and other industrial applications, STPP is used as a deflocculant in ceramic slip casting to reduce viscosity and improve fluidity. It finds application in leather processing, fur manufacturing, cement manufacturing, and soil stabilization. STPP is also used as a dispersant for acid suspensions, an anti-flocculation agent, a corrosion inhibitor, and a flotation aid.

Major Market Participants

The global supply system for sodium tripolyphosphate (CAS# 7758-29-4) features a pattern of “large-scale Chinese phosphate producers, multinational chemical companies, and regional manufacturers serving distinct market segments.” The global STPP market was valued at approximately USD 2.65 billion in 2025 and is projected to grow from USD 2.76 billion in 2026 to USD 3.41 billion by 2031, expanding at a CAGR of 4.3% during the forecast period. Other estimates place the market at USD 1.25 billion in 2025, growing to USD 1.31 billion in 2026. The market is driven by sustained demand from the detergent industry, food processing sector, and industrial applications.

In the global industrial and large-scale production segment, Chinese manufacturers have emerged as dominant players in the global supply chain. Leading Chinese producers include WENGFU GROUP CO. LTD., Yuntianhua Co., Ltd., and Yunphos (China). Other significant Chinese manufacturers include Chongqing Chuandong Chemical (Group) Co., Ltd., a company with over 60 years of chemical production and R&D history, and Henan Yulin Chemical Co., Ltd., which manufactures phosphate series including STPP in both technical and food grades. Henan Honghai Chemical Co., Ltd. is a professional production factory for STPP. Riel Chemical Co., Ltd. reports sodium tripolyphosphate production capacity of 150,000 tons. International players include PhosAgro Group (Russia) and various regional manufacturers worldwide.

In the global food and specialty grade segment, suppliers such as Harcros Chemicals offer specialized grades like STPP-067 TG for industrial processes. American Elements and Chem-Impex supply high-purity grades for research and specialty applications. XinChem is a reliable manufacturer and supplier of high-purity sodium tripolyphosphate from China, offering both Food Grade (≥94%) and Industrial Grade products with stringent quality standards for use in detergents, food processing, water treatment, and industrial applications.

Regional Market Dynamics

The global sodium tripolyphosphate market exhibits distinct regional characteristics, with production concentrated in Asia-Pacific (particularly China) and consumption distributed across North America, Europe, and the Asia-Pacific region, aligned with the detergent, food processing, water treatment, and industrial manufacturing industries in these regions.

The Asia-Pacific region is the dominant force in the global STPP market, accounting for the largest share of both production and consumption. China serves as the world’s manufacturing hub, with extensive production capacities and integrated supply chains for phosphate chemicals. The rapid growth of the detergent, food processing, and industrial manufacturing sectors in China, India, and Southeast Asia continues to drive regional consumption growth. Chinese manufacturers, including XinChem, offer the compound in multiple grades—Food Grade (≥94%), Industrial Grade, and Technical Grade—and various physical forms, serving both domestic and export markets with competitive pricing.

North America remains a key market for high-purity and specialty-grade STPP, driven by demand from the detergent industry, food processing sector, and industrial water treatment applications. The United States hosts numerous detergent manufacturers, food processors, and industrial facilities that require high-quality STPP for their operations. The region’s well-established regulatory framework, including FDA GRAS status for food applications, and emphasis on product quality support demand for high-grade STPP. The imposition of tariffs in 2025 has introduced new variables into procurement strategies, prompting buyers to review sourcing footprints and nearshore where feasible.

Europe is characterized by stringent regulatory requirements, including REACH registration, and a strong focus on sustainability in detergent and food applications. Regulatory tightening around phosphorus discharges is accelerating formulation innovation and driving interest in phosphate reduction or substitution where feasible. European detergent manufacturers, food processors, and industrial users demand high-purity STPP with comprehensive documentation.

Latin America and other regions represent growing markets, with demand driven by expanding detergent manufacturing, food processing, and industrial development.

Regulatory and Safety Considerations

As a widely used industrial chemical, food additive, and detergent ingredient, sodium tripolyphosphate (CAS# 7758-29-4) is subject to regulatory oversight in major global economies. Compliance with relevant regulations is essential for market access and trade.

In the United States, STPP is listed in the FDA’s Substances Added to Food (EAFUS) database and is recognized as Generally Recognized as Safe (GRAS) under 21 CFR 182.6810 for use in food applications when used in accordance with good manufacturing practice. It is also permitted as a food additive for direct addition to food for human consumption under 21 CFR Part 172. The compound has a FDA Unique Ingredient Identifier (UNII) of 5HK03SA80J.

In the European Union, STPP is registered under REACH (Regulation EC No. 1907/2006) and has an EINECS number of 231-838-7. It is approved as a food additive (E451). Manufacturers and suppliers must provide comprehensive Safety Data Sheets (SDS) and maintain appropriate documentation. Regulatory tightening around phosphorus discharges in the EU is accelerating formulation innovation and driving interest in phosphate reduction.

GHS classification and handling: STPP is classified as an irritant. It should be stored in a cool, dry place in tightly closed containers, protected from moisture. Standard industrial hygiene practices should be followed during handling, including the use of appropriate personal protective equipment (gloves, protective clothing, and eye/face protection). The compound is highly soluble in water and should be handled with care to avoid dust generation.

Environmental considerations: Phosphates in detergents have been a focus of environmental regulation due to their contribution to eutrophication in water bodies. This has led to phosphate reduction or substitution in some regions, prompting manufacturers to develop more sustainable formulations and explore alternative builders. However, STPP continues to be used in many applications where its unique sequestering properties are essential and where phosphate discharge is effectively managed.

Future Outlook

The market outlook for sodium tripolyphosphate is positive, supported by several key growth drivers across its major application segments. The global market is projected to grow from USD 2.65 billion in 2025 to USD 3.41 billion by 2031 at a CAGR of 4.3%.

Key growth drivers include:

1. Sustained demand from the detergent industry: The global detergent and cleaning products market continues to grow, driven by population growth, rising hygiene awareness, and increasing urbanization in emerging economies. STPP remains a critical builder in many detergent formulations.
2. Expansion of the food processing industry: The growing global demand for processed foods, seafood, meat products, and convenience foods drives consumption of STPP as a water retention agent, emulsifier, and quality improver (E451).
3. Growth in industrial applications: Increasing demand from water treatment, ceramics, mining, and oilfield applications supports steady consumption of STPP in industrial sectors.
4. Expansion of manufacturing in emerging economies: The growth of detergent, food processing, and industrial manufacturing in Asia-Pacific, Latin America, and other developing regions drives demand for STPP.
5. Innovation in detergent formulations: Advances in surfactant technology, enzymology, and polymeric builders are creating opportunities for STPP in next-generation detergent formulations.

Challenges and considerations:

• Regulatory pressures: Increasingly stringent environmental regulations on phosphorus discharges may limit STPP use in some detergent applications.
• Competition from alternatives: The market faces competition from alternative builders such as zeolites, citrates, and other phosphate substitutes.
• Feedstock and energy cost volatility: Fluctuations in phosphate rock and energy prices may impact production costs.
• Tariff impacts: Trade measures and tariffs can disrupt supply chains and affect procurement strategies.
• Environmental concerns: The contribution of phosphates to eutrophication may lead to further regulatory restrictions in some regions.

To succeed in this evolving market landscape, suppliers must focus on product quality (particularly purity and consistency), supply chain reliability, regulatory compliance, and responsive customer service. Companies that can offer high-purity products, flexible packaging options, and technical support for detergent, food, and industrial applications will be well-positioned to capture growing demand.

Shanghai XinChem Co., Ltd. (XinChem)

As a world-leading supplier of inorganic chemicals and phosphate products, Shanghai XinChem Co., Ltd. (XinChem) is dedicated to meeting the innovative needs of the detergent, food processing, water treatment, and industrial manufacturing industries. Leveraging extensive experience and advanced manufacturing capabilities, XinChem provides high-quality Sodium Tripolyphosphate (STPP, CAS# 7758-29-4) to customers worldwide. As a trusted manufacturer and supplier based in China, XinChem combines competitive pricing, reliable supply, and exceptional service to establish itself as a preferred partner for detergent manufacturers, food processors, water treatment facilities, and industrial customers seeking this versatile inorganic builder.

1. Technical Advantages

Advanced Manufacturing and Quality Control
XinChem utilizes state-of-the-art manufacturing facilities and rigorous quality control measures to ensure the purity, consistency, and safety of its STPP products. The production process incorporates advanced phosphate processing technologies, enabling the delivery of products meeting the highest industry standards. XinChem offers both Food Grade (≥94% purity) and Industrial Grade (≥94%–96% purity) products in various physical forms including powder, granules, and heavy dense granules. Strict process control ensures consistent product quality, minimal impurities, and batch-to-batch reproducibility, providing customers with reliable performance in detergent formulations, food processing, and industrial applications.

Full-Chain Quality Control
The production process strictly adheres to international quality standards, with comprehensive quality control covering raw material sourcing, in-process monitoring, and finished product testing. Each batch is accompanied by a detailed Certificate of Analysis (COA) documenting physical and chemical properties, purity data, pH, density, and impurity profiles. This commitment to quality ensures that XinChem’s STPP meets the stringent requirements of detergent, food, water treatment, and industrial applications.

2. Product Advantages

High Purity and Consistent Quality
XinChem offers sodium tripolyphosphate in multiple grades: Food Grade (≥94%) for food processing applications; Industrial Grade (≥94%–96%) for detergent and cleaning products; and Technical Grade for specialized industrial applications. The product’s high purity and consistent quality minimize the risk of impurities and variability, making it suitable for demanding applications in detergent manufacturing, food processing, water treatment, and industrial processes.

Comprehensive Specifications
Key specifications include:

• Molecular Formula: Na₅P₃O₁₀
• Molecular Weight: 367.86 g/mol
• CAS Number: 7758-29-4
• EINECS Number: 231-838-7
• Appearance: White, odorless crystalline powder or granules
• Purity: Food Grade (≥94%) / Industrial Grade (≥94%–96%)
• Density: 0.9–1.0 g/cm³
• pH (1% solution): 9–11
• Solubility: Highly soluble in water
• Grades: Food Grade, Industrial Grade, Technical Grade

Flexible Packaging Solutions
XinChem provides a range of packaging options to accommodate diverse customer needs, from laboratory-scale quantities to industrial-scale bags (25 kg, 50 kg), big bags (500 kg, 1000 kg), and bulk shipments. Customized packaging solutions are available upon request, ensuring safe handling, storage, and transportation. Recommended storage conditions include storage in a cool, dry place in tightly closed containers, protected from moisture.

3. Application Fields

As a multifunctional inorganic builder, Sodium Tripolyphosphate (CAS# 7758-29-4) exhibits wide application value across multiple industries:

Detergent and Cleaning Products:

• Core builder in laundry detergents and automatic dishwashing products
• Water softener sequestering calcium and magnesium ions to enhance cleaning efficiency
• Dispersant preventing redeposition of dirt and soils
• Soap builder and bar soap additive

Food Processing and Preservation:

• Food additive E451 for water retention in seafood, meats, and poultry
• Quality improver and emulsifier
• Sequestrant preventing oxidation and discoloration
• Texture enhancer and stabilizer in dairy and processed foods

Water Treatment:

• Scale inhibitor in boiler water and cooling water systems
• Industrial water softening agent
• Potable water treatment applications

Industrial Applications:

• Dispersant for drilling mud in oilfield operations
• Deflocculant in ceramic slip casting
• Leather processing, fur manufacturing, cement manufacturing
• Ore flotation and mining applications
• Corrosion inhibitor and flotation aid

4. Service Support

Technical Expertise and Customized Solutions
XinChem’s team of experienced chemists and application engineers provides full technical support throughout the customer journey—from product selection and specification development to application guidance and troubleshooting. Whether customers require optimization of detergent formulations, guidance on food processing applications, or assistance with water treatment processes, XinChem’s technical experts are ready to help.

Global Logistics and Reliable Supply
With established supply chains serving markets across Europe, North America, Asia-Pacific, and beyond, XinChem ensures timely delivery and consistent product availability. The company’s logistics team manages all aspects of international shipping, including customs clearance and documentation.

Regulatory Support
XinChem provides comprehensive documentation to support regulatory compliance, including Safety Data Sheets (SDS), Certificates of Analysis (COA), Halal and Kosher certifications where applicable, and other required certificates. The company stays current with evolving regulatory requirements in major markets, including FDA GRAS, REACH, and other regional regulations, helping customers navigate the complexities of global trade.

5. Reasons to Choose XinChem

• Professionalism: Extensive experience and deep expertise in phosphate product manufacturing and supply.
• Quality: Rigorous quality control, high purity (Food Grade ≥94%, Industrial Grade ≥94%–96%), and adherence to international standards.
• Reliability: Stable supply, competitive pricing, and timely delivery.
• Flexibility: Customized solutions to meet diverse customer needs, including custom packaging and grades.
• Service: Responsive technical support and comprehensive documentation.

Contact us today to start your partnership with XinChem!

Website: www.xinchem.com

Email: sales1@xinchem.com

WhatsApp: +86 18049800532